Hi sandbo,
In working with CPW lines in hfss, I've found that meshing the air gaps with a maximum length of half the gap width is sufficient for good convergence. I've also found that meshing the air gap seems to be more important than meshing the strip, which it appears what you are doing.

Hi ,
I am trying to simulate a structure in hfss and it does not have large number of meshes. Near convergence ( around 20 passes ) the total number elements are 286540. But my simulation slows down while computing Kyrlov matrices etc.
I have to finish this simulation and to see the results. I will be very thankful for quick help.
Thanks.

Hi all,
Newbee, first post, and still learning the rules and etiquette of this place. Be easy, k.
Here's the synopsis: I'm running an hfss driven terminal solution. The design is a spiral transformer--a single loop primary around a flat archemedean spiral of a few turns.
I've read in various places that specifying port impedance does no

In your design go to Results>Solution Data. A window with differece tabs pop up. One tab is convergence.
There you can find convergence, in my opinion is easy to look for the plot.
I have to say that in the Analysis Setup I always select : Options>Adaptative Options>Minimum Converged passes: 2. (Maybe it is by default)

hi
i am facing a problem,when i designed antenna and simulate i got convergence and got good results but when i simulate on same pc after 1 hour i got some results very different from previous one,i checked only differnce in both design is convergence point and max delta number,results that normaly changes are axial ratio and gain normaaly changes

Hi,
I have calculated E field and stored energy in a cavity using hfss eigen mode. So maximum delta (resonant) frequency is used as convergence criteria in this mode. Now there is a question: How E field or stored energy can be used as convergence criteria in eigen mode?

I am using a metamaterial as superstate to enhance gain of antenna.When i use 10 pass with center frequency 2.5 GHz for the frequency range of 1-3 GHz using fast sweep i got good result.But when i use 10 pass with center frequency 2 GHz for same frequency range of 1-3 GHz
i got poor both the cases hfss shows that convergence criteria i

Hi all
i read hfss user guide 11 but not able to understand the significance of convergence,
adaptive meshing, discrete meshin,
when we should choose in analysis set up as fast, linearcount , discrete and what they all mean
help in this respect
katik

The attached hfss file is for a half-wave dipole for 14.2 MHz. The dipole is only just over 1 m long, but is emmersed in water, so the relative permttivity is around 91, so it should resonate around 14.2 MHz or so, though perhaps a bit higher, as there is not a huge amount of water.
The problem is, the mesh will not converge. It slowly converge

There are four different design's that are mentioned in the tutorial,and there are some errors as well that have to be fixed in this tutorial
coming to your question.convergence is The criteria of hfss is based on S-parameter at the ports. S-parameter is the integration of field intensity on the port surface. So, S-parameter is considered converge

Hi
I am facing problems with meshing in hfss for a waveguide filter design
Can u suggest me any document of hfss inorder to setup the meshing and its convergence..
I can share my file with u ..if required.
Thanks
Venu

for most applications ΔS=0.02 is quite adequate. Decreasing the ΔS will result in a more complex mesh and more simulation time.
Maximum number of passes of about 6 to 15 is enough.
You can see the convergence data of your design by right clicking on the setup in project manager and selecting "convergence" from the pop-up menu. If it has

I am designing a dipole meander line antenna using hfss for RFID application that suppose to resonate around 1.5GHz frequency. And my Solutions frequency is 1.5Ghz, with sweep setup of fast sweep, sweeping from 500MHz to 2Ghz. I am using a wave port with an air box.
I have modeled the antenna in hfss and after the simulation, the (...)

Hello,
I am simulating a 2-18 GHz cavity backed spiral antenna in hfss but I am getting these warnings (mentioned below) in fast sweep when I decrease the spiral arm width to anything below 0.25 mm. I have searched alot on google and hfss guides but there is nothing on these warnings.
How can i remove this warning message and what do these war

Why simulators like hfss and CST use (as a default) absolute convergence criterion not relative? I guess the last method could be more accurate because it for example can make difference between s11(n)=1, s11(n-1)=0.9 and s11(n)=0.2, s11(n-1)=0.1. In the first case relative error is 11% in the second - 200%, but absolute error is constant = 0.1. W

Fast sweep setup, process hf3d: Poor convergence in computing port dispersion.
this is a warning i have some questions about:
1. what does it refer to?
2. what is "port dispersion"?
3. how can i control or determine the properties of this convergence?
4. to what level this error may effect my results?

Hello
I am using hfss for my PCB trace SI simulation. In my sweeps, the solver getting struck in one point at a particular interpolation error thinking that in that frequency convergence will occur. for example at freq 2.5 GHz where the interpolation error is 33%, the solver is thinking the convergence will occur at that frequency range (...)

Hi guys,
I have a problem with a simulation. The solution converges succesfully, but the results are not the waited. If I use a really low convergence condition, I get good results (not always).
Have you ever seen that problem? I think maybe there is something wrong in the model, and it causes errors if the mesh is enough fine. How do you se

You probably don't need deltaS that low. It defaults to .02, so unless you need some insane accuracy, you don't need .001. Try setting it at .01.
convergence is just when the deltaS gets below that value. Try setting it to deltaS=.01 and then forcing it to do 2 or 3 consecutive converged passes or something rather than a really low deltaS for (I

Hello,
does somebody know which mesh type is to chose in hfss for plane structures?
And if I have a radiation box which mesh type is to select for this.
I have read that for round structures with surface approximation the result will meet fast the convergence criterion. And to decide whether the mesh is good the optical look is important. Is

What that means is that the convergence was not reached by your adaptive passes (that is delta S is not under 0.02, which is typical value). You need to let the hfss solve more passes (increase the max adaptive passes value in the analysis-setup window).

Hi all!
I am very new in the hfss field, and I have one question. I wonder why sometimes the solution does not converge even if the maximum number of adaptive passes is not reached yet.
Thanks for your answers.
Bye

Hello,
I just need to know the exact definition of (solution frequency) in hfss?
hfss will optimize the mesh to reach convergence criteria at the solution frequency and eventually solve the field at that particular frequency only. When you choose "interpolation sweep", the rest of the frequencies are interpolated b

Dear all,
I notice several things in hfss. Please confirm when you ever noticed the same:
1. The convergence profile/curve is not the same when change the sweep method e.g. fast sweep or interpolation. Although, all other parameters remain the same.
2. Interpolation sweep works better over a broadband frequencies.
thanks.

Dear all,
I ran an hfss simulation and after 7 passes, it reached my convergence criteria. However, it could not run the frequency sweep (Fast sweep) due to out of memory.
Is it possible to get the mesh after 6 passes? I am just wondering if using the mesh after 6 passes would help reduce the memory significantly.
Would changing to interpo

Hi freek,
first your simulation is not converged, you should change your number of passes to 10 or 20 (I tried a good point at 12) for the convergence of simu,
second you have not the plan of mass, I think that it is better to add it ..

What results are you looking to get from hfss?
a) Be sure to check the current distribution. Se my posts in:
b) Do a convergence analysis by comparing s-parameters of runs with decreasing Delta-S error tolerance AND port error tolerance (if using wave ports). Do this in MWO also

please tell me whether its necessary that every
solution should converge somewhere when using hfss9.2
normally i just give the solution setup then sweep
with some step size ........and then validate it and
simply run and note the results.....
i don't go in RESULTS/SOLUTION DATA/convergence and
check whether the solution gets converged somew

I am experiencing a similar problem with hfss. I set up the simulation such that at least 5 runs converge. After a while convergence is achieved. Then in the subsequent 3-4 runs, the convergence is achieved. But suddenly at the 4th or 5th run there is an error of %98. Out of 36 runs, none of the 4 runs converged to the same value after one (...)

Yes, the waveport in hfss can have lossy dielectric and/or good (non-perfect) conductor.
my guess for your problem:
1. 2xTsub is hardly "large" enough, check convergence w.r.t. all the sizes that you set to be around 2xTsub.
2. make sure you understand the unit of the hfss answer correctly.

check the convergence in matrix data whether it is converged first;
try to reduce the convergence criteria and re-run the simulation again;
the difference of simulated S11, what kind of difference is it? for example, whether all the resonance are still there? whether the resonant frequency shifted? If only the magnitude of resonace different, mos

Hi,
I think you might have problems with plane wave excitation. Try to use the solver view option from hfss, to ensure that plane wave excitation is not overridden by other boundaries. also chek for convergence (let the minimum converged paths be 2 or 3).
BR
Adel_48

hi
itaifrenkel posted a message below. it would help:
hfss using convergence in order to get an accurate solution. After creating an initial mesh it starts doing adaptive passes until the desired error residual is achieved. In each stage it refines the mesh and resolves the problem. The resulting S-Matrix is compared to the previous one. The ma

Hi guys,
The time domain has an inherent limitation. In order to reduce the time step it needs to refine the grid (and the other way around).
I recommend to test Ansoft hfss which uses Finite Element Analysis. Not only that it has no refinment problems, but also you can control the accuracy of the convergence process. In pr

the simulation will terminate when either of these 2 criteria is met.
if you set the maximum number of passes to 6 and the model does not converge within 6 passes the simulation will stop regardless.
the maximum delta s defines the convergence criteria, if you use 0.02 it means that when the difference between two passes is less than 2% th

about the convergence message in hfss v9.0 :()
1. why the 6th and 8th pass gave Delta S in terems of N/A? what does N/A mean?
2. it seems Delta S becomes larger when pass Numbers increasing, I don't know if it's reasonable since I feel Delta S should get smaller with increasing pass Numbers solved.
Thanks in advance!
the next is a

If you first do the convergence analysis for a single frequency, the mesh used in the final pass is recorded.
There is an option for the mesh used in the frequency sweeping. Choose "current mesh"(?), then the sweep will be done with the mesh recorded above.